You can play a open G using the first 3 digits a little more difficult to learn but it is a common veriation?

Try plastic braces there are different types and sizes with a little hot water you can bend them to the shape required.

maybe this would help with muscle memory as well.

I would be carefully of wearing them for to long though?

hope this helps.

My fretting pinky is locked in a perminent L shape I have tryed most things over the years, now i have just accepted it and don't use it for scales, or anything above the e-b-g